I ran the ebc 3dg rotors and ebc green stuff pads on my last truck and they worked well, I'd say %10 improvement over stock. This time I upgraded to the ssbc big bite Drilled and slotted rotors, while you do loose some material as bri mentioned, the metallurgy of the rotor is designed to cycle heat way way more efficiently, and handle more heat, however, they disperse much much more heat by passing it through the disc to the open cooling vanes, effectively removing the heat, as well as having slots in the rotor surface to help to clean the pad and give a place for gases to go during braking. Win win situation.
Nevertheless, any upgrade by a reputable company, that incorporate features in the rotor to remove debris and gases will perform much better than stock, cuz it will allow the pad to be cooler cleaner and be in contact with the rotor surface 100% of the braking duty. Without these features the pad will actually start to float on gases developed during braking, reducing contact, reducing braking efficiency.....
Alligator has a nice brake upgrade kit, complete with russel braided lines, or the ebc 3dg rotors are pretty good too, with yellow stuff pads, or maybe the new orange stuff pads and you will have a brake package that will perform much much better than stock:thumb: